Building block



FIG. 1 is a top perspective of the building block.

FIG. 2 is a bottom perspective of the building block of FIG. 1 .

FIG. 3 is a top plan view of the building block of FIG. 1 .

FIG. 4 is a bottom view of the building block of FIG. 1 .

FIG. 5 is a first side elevational view of the building block of FIG. 1 .

FIG. 6 is a second side elevational view of the building block of FIG. 1 .

FIG. 7 is a first end elevational view of the building block of FIG. 1 .

FIG. 8 is a second end elevational view of the building block of FIG. 1 .

FIG. 9 is a cross-section view of the building block taken along line 9-9 in FIG. 3 ; and,

FIG. 10 is cross-section view of the building block taken along line 10-10 in FIG. 3 .

The broken lines depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for a building block, as shown and described herein. 